Question

Please SHOW YOUR WORK IM FAILING AND NEED HELP NOW

1) 2x-y=4
x+3y=9
2) 7x+5y=-8
-8x-3y=20

Answer 1

1) x = 3 y = 2

2) x = -4 y = 4

Explanation:

-y = 4 - 2x x + 3y = 9

y = 2x - 4 x + 6x - 12 = 9 (expanded) : x + 3(2x - 4)

7x = 9 + 12 = 21 so x = 3

y = 2 (3) - 4

y = 6 - 4 y = 2

5y = -8 - 7x -8x - 3y = 20

y = (-8 - 7x)/5 -8x - 3(-8 - 7x)/5 = 20

-8x (+ 24 + 21x)/5 = 20 -8(-4) - 3y = 20

(-40x + 21x + 24)/ 5 = 20 32 - 3y = 20

-40x + 21x + 24 = 20 x 5 = 100 32 - 20 = 3y

- 19x = 100 - 24 = 76 12 = 3y

x = - 4 y = 4